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Titolo:
BeppoSAX uncovers a type-2 QSO in the hyperluminous infrared galaxy IRAS 09104+4109
Autore:
Franceschini, A; Bassani, L; Cappi, M; Granato, GL; Malaguti, G; Palazzi, E; Persic, M;
Indirizzi:
Dipartimento Astron, I-35122 Padua, Italy Dipartimento Astron Padua Italy I-35122 nto Astron, I-35122 Padua, Italy CNR, ITeSRE, I-40126 Bologna, Italy CNR Bologna Italy I-40126CNR, ITeSRE, I-40126 Bologna, Italy Osservatorio Astron Padova, I-35122 Padua, Italy Osservatorio Astron Padova Padua Italy I-35122 ova, I-35122 Padua, Italy Osservatorio Astron Trieste, I-34131 Trieste, Italy Osservatorio Astron Trieste Trieste Italy I-34131 I-34131 Trieste, Italy
Titolo Testata:
ASTRONOMY AND ASTROPHYSICS
fascicolo: 3, volume: 353, anno: 2000,
pagine: 910 - 916
SICI:
0004-6361(200001)353:3<910:BUATQI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISTRIBUTIONS; P09104+4109;
Keywords:
X-rays : galaxies; galaxies : active; galaxies : individual : IRAS 09104+4109;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Franceschini, A Dipartimento Astron, Vicolo Osservatorio 5, I-35122 Padua,Italy Dipartimento Astron Vicolo Osservatorio 5 Padua Italy I-35122
Citazione:
A. Franceschini et al., "BeppoSAX uncovers a type-2 QSO in the hyperluminous infrared galaxy IRAS 09104+4109", ASTRON ASTR, 353(3), 2000, pp. 910-916

Abstract

We studied with BeppoSAX the infrared luminous galaxy IRAS 09104+4109 overa very wide X-ray band from 0.1 to 80keV. Our observations indicate the dominance of a thermal component at energies below 8 keV, which we attribute to the free-free emission from the intracluster (IC) plasma surrounding thesource. Above 10keV we find evidence for the existence of flux in excess with respect to the free-free IC plasma emission. This, together with the marginal detection of a neutral iron line at N 64keV, gives a strong indication for the presence of an AGN deeply buried within the source. This component is best modelled by a strongly absorbed (NH greater than or equal to 5 x10(24)cm(-2)) power-law plus unabsorbed reflection spectrum (0.15 less than or equal to R less than or equal to 0.3), which is also responsible for the cold iron line. The unabsorbed broad-band (2-100 keV) X-ray emission of this AGN is 2.5 x 10(46) erg s(-1), well within the range of quasar luminosities. Our results indicate that IRAS 09104+4109 is indeed the prototype ofa rare class of sources, the luminous type-2 QSOs. The association of thissource with a huge cooling-how of similar to 1000 M., in the cluster, as indicated by the X-ray data, might suggest that such condition of extremely fast mass accumulation could favour the survival of a thick obscuring envelope, which would otherwise be quickly destroyed by the very luminous central source.

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Documento generato il 26/09/17 alle ore 09:23:41